I noticed ants crawling all over and inside two of my hives today, so I surrounded the hives with cinnamon.
I’ve read many times that cinnamon repels ants, though I’ve never seen it myself. I sprinkled some cinnamon around one of my hives a year or two ago, but then it rained, so I don’t know if it works. Whether it works or not, I’m not too concerned about the ants. I think it would take a biblical amount of ants to do significant damage to a hive full of bees. We’ll see.